Darkex offers their users a calculator to preview their liqiudation price.
To check the calculator, you can go to https://futures.darkex.com/en_US and click on the calculator icon located on the top right corner.
After clicking to this icon, you'll be able to see 3 different calculations: Profit/Loss, Target Price and Liqiudation price.
When you click on the Liqiudation price button, you'll see places where you have to provide inputs:
After replicating the order that you would like to see your liquidation price on, pressing calculate will yield the price that this transaction will liquidate.